Method of fabricating a butterfly valve
US3961405A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1975 |
| Grant date | Jun 8, 1976 |
| Priority date | — |
| Expiry date | Jun 2, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49893
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The butterfly valve includes a body having a generally cylindrical bore defining a flow passage and a generally circular, stem-mounted disc member rotatably mounted within the bore for shutting off flow. The disc member is comprised of two identically arranged halves which are formed from an inexpensive, relatively thin material. The disc halves include central semicylindrical portions defining a hub for receiving the stem and a flange defining a continuous, peripheral groove including diametrically opposed annular portions which encircle the stem. Disposed in the disc groove is a unitary, resilient sealing ring including annular sections which engage flattened portions of the bore to provide stem seals throughout all positions of the disc and semicircular portions which sealingly engage the bore when the disc member is in a closed position. The disc halves and sealing ring can be assembled together before installation of the disc member into the valve body bore or assembled together inside the valve body bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.